單項(xiàng)選擇題

Set of current is（）.

A.velocit in knot
B.irection from which it flows
C.estimated current
D.direction toward which it flows

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Several shoals（）reported to exist in the area south-west of the Brothers.

A.have
B.have been
C.has
D.has been

單項(xiàng)選擇題

A system of cleaning the tanks by washing them with the cargo of crude oil while it is being discharged is known as（）.

A.cow
B.lot
C.cbt

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